Tags: Chemical Substance, Mineral.
Aphthitalite is a potassium sulfate mineral with the chemical formula: (KNa)3Na(SO4)2.It was first described in 1835 for an occurrence on Mt. Vesuvius Italy. The name is from the Greek άφθητος unalterable and άλας salt for its stability in air. It occurs as fumarolic incrustations in volcanic environments as small crystals and masses in evaporite deposits and in guano deposits.